https://www.reuters.com/article/us-usa-trump-russia-socialmedia/social-media-executives-to-testify-nov-1-about-russia-and-u-s-election-idUSKBN1CA2VC >Executives from Facebook Inc , Twitter Inc and Alphabet Inc's Google have been asked to testify about Russian meddling in the 2016 U.S. election before a House of Representatives panel on Nov. 1, a congressional aide said on Thursday.